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Old 01-30-2009, 03:27 PM
Junior Member
Join Date: Jan 2009
Posts: 1
Default check engine light, error code help

k, so i have a scanner that shows what the error code is on why my check engine light is on but i don't know what the code means, it says p0420 catalyst below threshold (Bank 1). Does anyone know what that means?
thanks for the help!!
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